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    <title>分组和嵌套示例</title>
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    <link rel="stylesheet" href=css/index44.css">
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<div id="d1">我是一个div标签</div>
<p id="p1" style="color: yellow">我是一个p标签</p>

<div id="d2" class="">10个类选择器</div>


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